|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||CFD Modeling and Simulation in Materials Processing
||Modelling Directional Solidification in a Transverse Magnetic Field Validated via High Speed Synchrotron X-Ray Tomography
||Andrew Kao, Biao Cai, Peter D Lee, Koulis Pericleous
|On-Site Speaker (Planned)
TESA is a 3-dimensional multi-physics numerical model that couples fluid flow, solidification and electro-magnetism. It is used here to investigate the influence of a transverse magnetic field on microstructural evolution during directional solidification. Validation is via comparison to synchrotron X-Ray tomography. During tomography, the sample rotates in the static magnetic field, leading to a complex interaction between 3 flow mechanisms: natural convection due to solute partitioning, inter-dendritic flow from a rotating thermoelectric force and EM damping of bulk solid body rotation. The combined effect is the formation of a helical/screw-like microstructure, which can be controlled by the intensity of the magnetic fields and rotation rate. Numerical simulations identify the mechanisms and explain the complex interaction of these hydrodynamic features and solidification. The results are compared to real time tomographic results obtained at the European Synchrotron Research Facility in France and Diamond Light Source in the UK.
||Planned: None Selected